145891385 has 4 divisors (see below), whose sum is σ = 175069668. Its totient is φ = 116713104.

The previous prime is 145891379. The next prime is 145891391. The reversal of 145891385 is 583198541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583198541 = 541 ⋅1078001.

It is an interprime number because it is at equal distance from previous prime (145891379) and next prime (145891391).

It can be written as a sum of positive squares in 2 ways, for example, as 35557369 + 110334016 = 5963^2 + 10504^2 .

It is a cyclic number.

It is not a de Polignac number, because 145891385 - 2²² = 141697081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14589134 + ... + 14589143.

It is an arithmetic number, because the mean of its divisors is an integer number (43767417).

Almost surely, 2^145891385 is an apocalyptic number.

It is an amenable number.

145891385 is a deficient number, since it is larger than the sum of its proper divisors (29178283).

145891385 is an equidigital number, since it uses as much as digits as its factorization.

145891385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29178282.

The product of its digits is 172800, while the sum is 44.

The square root of 145891385 is about 12078.5506166924. The cubic root of 145891385 is about 526.4331334349.

The spelling of 145891385 in words is "one hundred forty-five million, eight hundred ninety-one thousand, three hundred eighty-five".